Science chemistry - acids bases and salts

Why does tooth decay start when the pH of mouth is lower than 5.5

Dharun
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Shailvi
15 जून

When the pH of our mouth is lower than pH range 5.5 then our mouth became a little much acidic and then at that condition bacteria started action sugary food particles to decompose it. By this tooth decay starts boz action of bacteria and acid formed causes cavities in our tooth enamel.